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Refinement of Strut-and-Tie Model for Reinforced Concrete Deep Beams

Author

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  • Mohammad Panjehpour
  • Hwa Kian Chai
  • Yen Lei Voo

Abstract

Deep beams are commonly used in tall buildings, offshore structures, and foundations. According to many codes and standards, strut-and-tie model (STM) is recommended as a rational approach for deep beam analyses. This research focuses on the STM recommended by ACI 318-11 and AASHTO LRFD and uses experimental results to modify the strut effectiveness factor in STM for reinforced concrete (RC) deep beams. This study aims to refine STM through the strut effectiveness factor and increase result accuracy. Six RC deep beams with different shear span to effective-depth ratios (a/d) of 0.75, 1.00, 1.25, 1.50, 1.75, and 2.00 were experimentally tested under a four-point bending set-up. The ultimate shear strength of deep beams obtained from non-linear finite element modeling and STM recommended by ACI 318-11 as well as AASHTO LRFD (2012) were compared with the experimental results. An empirical equation was proposed to modify the principal tensile strain value in the bottle-shaped strut of deep beams. The equation of the strut effectiveness factor from AASHTTO LRFD was then modified through the aforementioned empirical equation. An investigation on the failure mode and crack propagation in RC deep beams subjected to load was also conducted.

Suggested Citation

  • Mohammad Panjehpour & Hwa Kian Chai & Yen Lei Voo, 2015. "Refinement of Strut-and-Tie Model for Reinforced Concrete Deep Beams," PLOS ONE, Public Library of Science, vol. 10(6), pages 1-17, June.
    • Handle: RePEc:plo:pone00:0130734
    DOI: 10.1371/journal.pone.0130734
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    Cited by:

    1. Pu Wang & Zhen Huang, 2017. "A unified approach for determining the ultimate strength of RC members subjected to combined axial force, bending, shear and torsion," PLOS ONE, Public Library of Science, vol. 12(4), pages 1-22, April.
    2. Jiuk Shin & Kihak Lee, 2023. "Investigation of Load-Bearing Capacity for Reinforced Concrete Foundation Retrofitted Using Steel Strut–Tie Retrofit System," Sustainability, MDPI, vol. 15(13), pages 1-16, June.

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